Here is a list of resources to help you troubleshoot your Zooz ZEN51 Dry Contact Relay and navigate the documentation that’s already out there 
We try our best to keep the Zooz Support Portal updated and continue adding helpful articles every day so take a look at the most popular docs first, there’s a good chance your question has already been answered! 
ZEN51 FAQ: the best place to start 
How does the Dry Contact Relay compare to other Zooz smart relays?
3-Way Wiring Diagrams for the ZEN51 Dry Contact Relay
OTA Firmware Update Files: read all of the disclaimers carefully before applying an update to your device to avoid accidental bricking 
ZEN51 Change Log: where we keep track of all the updates made to the hardware and software of the device.
ZEN51 Specs: make sure you’re using your device with an approved load and power supply.
ZEN51 Advanced Settings: learn how to customize your device.
Detailed Support for ZEN51 Dry Contact Relay & Your Hub: